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J. Phys. IV France
Volume 05, Numéro C2, Février 1995
IIIrd European Symposium on Martensitic Transformations
Page(s) C2-95 - C2-98
IIIrd European Symposium on Martensitic Transformations

J. Phys. IV France 05 (1995) C2-95-C2-98

DOI: 10.1051/jp4:1995214

Thermal and Magnetic Properties of Stress-Induced Martensites in Ni-Mn-Ga Alloys

V.A. Chernenko1, A. Amengual2, E. Cesari2, V.V. Kokorin1 and I.K. Zasimchuk1

1  Institute of Metal Physics, Verdnadsky str. 36, Kiev 252680, Ukraine
2  Department de Física, Univ. de les Illes Balears, E-07071 Palma de Mallorca, Spain

The stress-induced transformation of single crystals of Ni-Mn-Ga ferromagnetic Heusler ordered alloys to new martensitic structures has been investigated. The intermartensitic transformations, whenever they occur, were registered during heating by calorimetry, dilatometry and magnetic susceptibility measurement, showing up a step-like strain recovery, small endothermal effects, and an abrupt change of the low-field magnetic susceptibility. During intermartensitic transformations, between modulated and unmodulated lattices, as well as during the final transformation to the parent austenitic phase, noticeable anomalous changes in the specific magnetization were observed.

© EDP Sciences 1995